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If (a_1=50) and (a_{n+1}=a_n-10), what is (a_4)?

Answer and explanation

Correct answer: 20

The recursive rule makes each new term 10 less than the previous term. Thus, a_2=40, a_3=30, and a_4=20. Therefore, 20 is correct. The value 30 is the third term, not the fourth. Exam tip: for a recursive sequence, list the terms step by step up to the required term.

Related tags

Recursive SequencesRecursive RuleArithmetic ProgressionClass 9Sequence TermsSequences And ProgressionsMathematicsClass 9 Mcq

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